Quercetin is a strong antioxidant flavonoid present in many plants such as onions, apples, and berries. It helps calm inflammation, helps as a natural antihistamine, and bolsters the immune system. People often take it as a supplement to ease allergy symptoms and promote cardiovascular health, though prolonged, high‑dose consumption may lead to side effects like headaches or tingling sensations.
Quercetin enhances immune function, lessens inflammation, and promotes heart health.
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